SunAura Thermal

Graphene Heating Film & Thermostat Factory

Underfloor Heating System Commissioning: Testing and Balancing Guide

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Commissioning is the critical final step in any underfloor heating installation. It is the process of testing, balancing, and verifying that the system performs according to design specifications before handing it over to the end user. Proper commissioning ensures optimal performance, energy efficiency, and longevity of the system. This guide covers the complete commissioning process for both electric and water-based underfloor heating systems.

Pre-Commissioning Checks

Before beginning the commissioning process, verify that all components are correctly installed. For electric systems, check that all heating mats or films are properly connected, the cold leads are routed to the thermostat location, and the floor sensor is installed in conduit. For water-based systems, verify that all pipe circuits are correctly connected to the manifold, the pressure test has been completed, and the screed has fully cured (typically 28 days for cement-based screed). Ensure all electrical connections are made by a qualified electrician and the circuit is protected by an RCD.

Electrical Testing for Electric Systems

Electrical testing is the first step in commissioning an electric underfloor heating system. Measure and record the resistance of each heating circuit using a multimeter. Compare the measured values to the manufacturer specifications. Any deviation greater than 10% from the specified value indicates a potential problem that must be investigated. Next, measure the insulation resistance between each conductor and the earth screen, which should exceed 1 megohm. Record all measurements on the commissioning certificate for future reference.

Flow Balancing for Water-Based Systems

Flow balancing is essential for water-based underfloor heating systems to ensure even heat distribution across all circuits. Begin by setting all flow meters to their calculated flow rates, typically 2-5 liters per minute per circuit depending on circuit length and heat output. Start the circulation pump and allow the system to reach operating temperature. Check the supply and return temperatures on the manifold thermometers. The temperature difference (delta-T) should be 5-10 degrees Celsius. If the delta-T is too high, increase the flow rate. If too low, decrease the flow rate. Adjust each circuit individually until all circuits show similar delta-T values.

Thermal Performance Verification

After electrical testing or flow balancing, verify the thermal performance of the system. Set the thermostat to 25 degrees Celsius and allow the system to operate for at least 2 hours. Use an infrared thermometer to measure the floor surface temperature at multiple points across the heated area. The temperature should be uniform, with no more than 2 degrees variation between the warmest and coolest points. Any cold spots indicate a problem with the installation that should be investigated and rectified.

Thermostat Configuration

Configure the thermostat according to the floor covering type and user preferences. Set the floor temperature limit appropriate for the covering: 27 degrees for laminate and wood, 29 degrees for tile and stone. Set the initial comfort temperature to 21-22 degrees. Program a basic schedule with morning, daytime, evening, and overnight periods. For WiFi thermostats, connect to the home network, create a user account, and configure remote access. Test the smart features including geofencing, weather integration, and energy monitoring.

Gradual Warm-Up Protocol

For newly installed systems, especially those with fresh screed or mortar, a gradual warm-up protocol is essential to prevent thermal shock that could cause cracking. Start the system at 15-18 degrees Celsius and increase by 2 degrees per day until the target temperature is reached. For cement-based screeds, this process should take at least 7 days. For anhydrite screeds, allow 14 days. Once the target temperature is reached, maintain it for 24 hours before allowing the system to cycle normally.

Documentation and Handover

Complete the commissioning documentation, including: system layout drawings showing the location of all heating elements and sensors, electrical test results, flow balancing records (for water-based systems), thermostat configuration details, and operating instructions. Provide the end user with a comprehensive handover pack that includes warranty information, maintenance instructions, emergency shutdown procedures, and contact details for technical support. SunAura Thermal provides commissioning templates and technical support to ensure every installation meets the highest standards.

Conclusion

Proper commissioning is the difference between a heating system that performs flawlessly for decades and one that causes ongoing problems. By following a systematic process of testing, balancing, verification, and documentation, installers can ensure that every SunAura Thermal underfloor heating system delivers optimal comfort, efficiency, and reliability from day one.

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